And george place



(No Model.) 2 Sheets-Sheet 1.

A. Woon an PLACE.

GENTERING MACHINE.

' 2 sheets-msnen?.

Patented Mey 31, 1887.

(Ne Medel.)

A. WOOD ae G. PLAGE. GBNTERING MACHINE Ne. 363,874'.

UNTTED v STATES BATENT r-Trcn.

NEV YORK, N. Y.; SAID YOOD AS OF NEV YORK, N. Y.

SIGNOR TO CORNELlUS VAN BRUNT,

CENTER!MGi-'MACHINE.l

SPECIFICATION forming part of Letters Patent No, 363,874, dated May 31, 1887.

Application filed Oitober 26, ll. `Serial No. 181,020. (No model.)

' Figure 1 shows a front elevation 3 Fig. 2, a

sectional view on line X X, Fig. 4. Fig. 3 is a top view. Fig. 4 is an end view. Fig. 5 is a transverse sectional view on line S S, Fig. l; and Fig. 6 shows a portion of-y the under side of one ofthe saddles G G.

Similar letters refer to similar parts in the several views.

Our invention relates to certain improvements in machines for centering7 the ends of shafts, spindles, or bars of metal which are to be turned; and it consists in the use of two centering-spindles to which a simultaneous longitudinal movement is given by which both rotating' drills are carriedat the same time to the ends of the bar to be centered, in the construction and arrangement of the mechanism for so moving the centering-spindles, in devices for clamping the shaft, which are adjustable along the bed of the machine, in an adjustable head by which shafts of varying lengths may be centered, and in the construction and arrangement of the several parts, as hereinafter described.

A A is the frame or bed of the machine, on v which are mounted the two heads B and B'. The head B is attached to the bed and the head B' has a sliding motion along the way ac, permitting the space between theheads to be varied as longer or shorter. shafts are to be centered, the head being fastened to the bed, when the machine is in operation, by a tighteningscrew, a', which, passing through the gib c2 andentering the base of the head, serves to firmly clamp the head Bto the bed of themachine. The belt-pulleys C G have long hubs, which form the bearings Z) b', held in the heads B B', and through which vthe spindles D D' have a sliding motion, rotary motion being imparted to the spindles from the pulleys by means of the splines c c'.

j The spindles D D carry sleeves d d', with teeth on their under sides, and vheld between .the shoulders d2 and the nuts d3, and are prevented from turning by splines e e' in the heads B B. Pinionsf andf, turning on studs in the head B, connect the toothed sleeve d with the rack E, sliding in a groove in the bed of the machine, and the pinionsf2,f3, and f4t connect the opposite end ofthe rack E -with the toothed sleeve cl.

'versing the motion of the sleeves d d' and spindles D D. Between the heads B B We place the clamping-jaws E F' and E2 Ff, sliding in ways on the saddles G G and actuated by the right and left hand screws H H', which are held in bearings g3 g4 on the saddles G G', and are operated by the cranks h 71.. The sliding jaws hold the detachable blocks I, presenting y the opposing re-entering'reetangular faces t' i, t

between which the shaft J to be centeredis held.

The blocks I are readily removed and others substituted adapted to the different sizes of shafts. Upon the under sides of the saddles G G' are the cani-levers lo k', turning upon studs Z Z in the saddles. and pressing against the shoe L,viitting the way c, so that a slight rotation of the cams will clamp the saddles G G' trmly on the way of the machine, allowing the position of the shaft-holding jaws to be changed at will. one pair of jaws will usually be sufficient.

When the movable head 'B' is to be adjusted for different lengths of shafts, the screw c' is loosened and the pinion f moved on its stud out of gear, allowing the head to be placed in the desired position on the way a c and again clamped by the screw a', and the pinion j put In case short pieces are to be centered,`

Y a motion of the lever g2.

in gear. The spindles are then separated by The shaft to be centered is placed between the opposing faces of the sliding jaws F, F', F, and F3, the rotation of the right and left hand screws H H bringing thev jaws firmly against the sides of the shaft. The motion of the lever g2 is then reversed and the spindles D D carried toward each other, bringing the drills K K in position to bore a center hole in both ends of the shaft J at the same time.

The axes of the spindles D D' are in alignment, and the jaws, Which are brought in contact with the periphery of the shaft J at or near its ends, hold the shaft in proper position to be centered by the action of the drills K K'.

What We claim as our invention, and desire to secure by Letters Patent, is*

l. The combination, with the rotating spindles, of sleeves provided with teeth, a rack slidingin Ways, and pinions intermediate the rack and toothed sleeves, so the longitudinal l motion of the rack will produce asimultaneous sliding motion of the spindle toward or away from each other, as and for the purpose set 25 forth.

2. The combination, with the bed A and heads B B', carrying the opposing drill-holding spindles D D', of shaft-holdingjaws adjustable on the bed of the machine and cam-levers 3o 7a k', acting against the bed ofthe machine, as and for the purpose set forth.

3. The combination, with a pair of opposing drill-holding spindles having geared sleeves, of

a sliding rack geared to the toothed sleeves by 3 5 

